Crucible-cover.



T. MGGRATH.

GRUOIBLE COVER.

APPLICATION FILED SEPT. 25, 1911,

Patented June 18, 1912.

IVVENTOR.

BY W

WITNESSES.-

ATTORNEY.

ANocnAPn co UNITED STATEE PATENT OFFICE.

THOMAS McGBATI-I, OF SPRINGFIELD, MASSACHUSETTS.

CRUCIBLE-GOVER.

To allwhom it may concern:

Be 1t known that I, Ti-ioMAs MoGRA'rH, a citizen of the United States, residing at .No. 50 Thomas street, Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in CrucibleCovers, of which the following is a specification.

My invention relates to improvements in crucibles for melting metal, brass and all other alloys of metal; and the object of my improvements is to provide a cover, which is separate from the crucible, which may be placed thereon when the contents are to be poured, and which when so placed will remain in position until the tongs are removed and until the operator sees fit to remove it.

In the accompanying drawings, Figure 1 is a side elevation of a crucible with my cover placed thereon. The cover is held in position by the tongs. Fig. 2 is a vertical section of the line a-a in Fig. 5. Fig. 3 is a top plan of my cover showing the spring attached thereto. Fig. 4 is a side elevation of my cover with the spring attached thereto. Fig. 5 is a top plan of my cover in position on a crucible.

Number 1 designates the tongs; 2 the crucible; 3 the cover; 4 the spring; 5 the fasteners; and 6 the extended ends of the spring 4. When the cover 3 is to be used it is placed on the crucible 2 with the extensions 6 of the spring 4 pointing upward as shown in Figs. 1,2, and 4. The cover 3 is securely held in position by the downward pressure of the tongs 1 upon the extensions 6 of the spring 4. The cover 3 may be made of the same material as the crucible, or any other substance which will successfully resist the heat of the metal. The cover 3 is Specification of Letters Patent.

Application filed September 25, 1911.

Patented June 18, 1912.

Serial No. 651,105.

removed and the metal is reduced to a liquid form in the usual manner by the application of heat thereto. When the metal is ready to pour, the cover 3 is placed in position as shown, on the crucible 2, and held in said position by the spring 4 at its extensions 6. The cover 3 prevents the too rapid oxidation of the metal, and the escape of noxious gases. In the use of the cover 3, more uniform castings are obtained; a great saving of quantitya-nd quality of the metal is experienced; the need of skimming or removing the dross prior to pouring the metal is eliminated; and the services of an extra man with a skimmer, tongs, or other implement necessary to hold other covers in place is dispensed with, while the metal is being distributed.

I am aware that a prior patent shows and describes a crucible cover with a guard extending downward and into the crucible. Such cover is hereby disclaimed.

I claim as my invent-ion 1. A crucible cover having attached thereto on its upper surface an arched spring with the ends of its member forming such arch extending vertically above the surface of the cover.

2. A crucible cover having attached thereto on its upper surface an arched spring with the ends of its member forming such arch extending vertically above the surface of the cover, and said vertically extending ends having lateral extensions attached thereto.

THOMAS MCGRATH.

Witnesses CHARLES H. Peon, JOHN F. CARPENTER.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents.

Washington, D. G. 

